London, Robert Hale, 1963. First Edition. First Impression. Hardback. A fine copy. Uncommon. Published two years earlier in the US by Scribner's, and still two years before that in serial form as The Time Sweepers. A time travel novel wherein the protagonist attempts to fix the screwed-up timelines, encountering dinosaurs, robots with an agenda and (I quote) a lovely, simple girl (because it's 1960's sci-fi!) A sharp copy. Top edge just a little dusty. Most copies went to the public libraries, so pleasing to see one that never met such fate and remains in such nice condition [Clute & Nicholls, p697]. [7778, Hyraxia Books].